Supreme Court rules 9-0 that warrant absolutely needed for police GPS tracking

It seems mind-boggling for me that the mere fact that the device was installed by the then-owner would be enough to make this OK without a warrant. It seems no different than leaving a sticky tracking device on a public street where you know the suspect is going walk, so that he unknowingly picks it up on his shoe and can be monitored...pretty much forever.

EDIT: Wait, on second thought, are you sure? The main opinion says

> The first case, Knotts, upheld against Fourth Amendment challenge the use of a “beeper” that had been placed in a container of chloroform, allowing law enforcement to monitor the location of the container. 460 U. S., at 278. We said that there had been no infringement of Knotts’ reasonable expectation of privacy since the information obtained—the location of the automobile carrying the container on public roads, and the location of the off-loaded container in open fields near Knotts’ cabin—had been voluntarily conveyed to the public.6 Id., at 281–282. But as we have discussed, the Katz reasonable-expectation-of-privacy test has been added to, not substituted for, the common-law trespassory test. The holding in Knotts addressed only the former, since the latter was not at issue. The beeper had been placed in the container before it came into Knotts’ possession, with the consent of the then-owner. 460 U. S., at 278. Knotts did not challenge that installation, and we specifically de- clined to consider its effect on the Fourth Amendment analysis. Id., at 279, n. Knotts would be relevant, perhaps, if the Government were making the argument that what would otherwise be an unconstitutional search is not such where it produces only public information. The Government does not make that argument, and we know of no case that would support it.

To me, that says that Knotts is distinguised because all the data that the police used was available publicly, i.e. that Knotts did not have a reasonable expectation of privacy (which, presumably, Jones did in the recent case).

Basically the Govt. tried to convince the court that their bungling did not matter because a "warrant" not needed to begin with as it was not a "search" as defined in the 4th amendment. The Supremes slapped the hell out of that argument and thus created a major ruling that now impacts all govt. actions on GPS. The irony is awesome.

> One of the Obama administration’s main arguments in support of warrantless GPS tracking was the high court’s 1983 decision in United States v. Knotts, in which the justices said it was OK for the government to use beepers known as “bird dogs” to track a suspect’s vehicle without a warrant. In that case, the police had the consent of that truck’s owner, which was not the case in the opinion decided Monday, Scalia wrote.

So they had "the consent of that truck’s owner". I'd like to know what they specifically meant with this though.

Scalia is a kind of a Fourth Amendment hardliner when it comes to _the home_, so I'm actually surprised at this result. Fourth Amendment rights in so far as automobiles go have been eroding for years. Note that the concurring opinion wanted to reframe the issue such that there _was_ a reasonable expectation of privacy when it comes to automobiles (which would be a more expansive reading of Fourth Amendment rights).